| 1 | // Copyright (C) 2023 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #ifndef QV4L2MEMORYTRANSFER_P_H |
| 5 | #define QV4L2MEMORYTRANSFER_P_H |
| 6 | |
| 7 | #include <private/qtmultimediaglobal_p.h> |
| 8 | #include <qbytearray.h> |
| 9 | #include <linux/videodev2.h> |
| 10 | |
| 11 | #include <memory> |
| 12 | |
| 13 | QT_BEGIN_NAMESPACE |
| 14 | |
| 15 | // |
| 16 | // W A R N I N G |
| 17 | // ------------- |
| 18 | // |
| 19 | // This file is not part of the Qt API. It exists purely as an |
| 20 | // implementation detail. This header file may change from version to |
| 21 | // version without notice, or even be removed. |
| 22 | // |
| 23 | // We mean it. |
| 24 | // |
| 25 | |
| 26 | class QV4L2FileDescriptor; |
| 27 | using QV4L2FileDescriptorPtr = std::shared_ptr<QV4L2FileDescriptor>; |
| 28 | |
| 29 | class QV4L2MemoryTransfer |
| 30 | { |
| 31 | public: |
| 32 | struct Buffer |
| 33 | { |
| 34 | v4l2_buffer v4l2Buffer = {}; |
| 35 | QByteArray data; |
| 36 | }; |
| 37 | |
| 38 | QV4L2MemoryTransfer(QV4L2FileDescriptorPtr fileDescriptor); |
| 39 | |
| 40 | virtual ~QV4L2MemoryTransfer(); |
| 41 | |
| 42 | virtual std::optional<Buffer> dequeueBuffer() = 0; |
| 43 | |
| 44 | virtual bool enqueueBuffer(quint32 index) = 0; |
| 45 | |
| 46 | virtual quint32 buffersCount() const = 0; |
| 47 | |
| 48 | protected: |
| 49 | bool enqueueBuffers(); |
| 50 | |
| 51 | const QV4L2FileDescriptor &fileDescriptor() const { return *m_fileDescriptor; } |
| 52 | |
| 53 | private: |
| 54 | QV4L2FileDescriptorPtr m_fileDescriptor; |
| 55 | }; |
| 56 | |
| 57 | using QV4L2MemoryTransferUPtr = std::unique_ptr<QV4L2MemoryTransfer>; |
| 58 | |
| 59 | QV4L2MemoryTransferUPtr makeUserPtrMemoryTransfer(QV4L2FileDescriptorPtr fileDescriptor, |
| 60 | quint32 imageSize); |
| 61 | |
| 62 | QV4L2MemoryTransferUPtr makeMMapMemoryTransfer(QV4L2FileDescriptorPtr fileDescriptor); |
| 63 | |
| 64 | QT_END_NAMESPACE |
| 65 | |
| 66 | #endif // QV4L2MEMORYTRANSFER_P_H |
| 67 |